Pressing OK on the Note Property dialogue crashes the application!

Try installing the Original Note Property version. If this does not work, please contact me on Twitter, @_Hairclips

I can only see "designable.nib" and "keyedobjects.nib"!

This is a known issue with applications such as iZip that allow you to browse zip files without decompressing them. The top level of the zip (MainMenu.nib) is a technically a directory, applications such as these open that directory automatically. You can solve this issue using your existing software by going "up". If you don't know what that entails; please just locate the downloaded zip file (such as "P01R04-C.zip"), right click it and open with > Archive Utility. This will result in a .nib you can use.

My issue is not listed here! / I need help!

Please contact me on Twitter! @_Hairclips! My DMs are open to the public.

6. Navigate to ./Contents/Resources/English.lproj if your system language is English or ./Contents/Resources/Japanese.lproj if your system language is Japanese. You do not need to replace the MainMenu.nib in both, but you may if you like. If you have download Localizable.strings, you need to replace the one in this directory too.

7. Inside, you will see "InfoPlist.strings", "Localizable.strings" and "MainMenu.nib". We are only interested in the MainMenu.nib

8. Replace the MainMenu.nib in the UTAU-Synth application contents with the one provided